EPM7128STC100-7 Equivalent & Substitute Parts

Part Overview

The EPM7128STC100-7 is a Complex Programmable Logic Device (CPLD) from Intel's MAX® 7000S series, featuring 128 macrocells and 2500 gates in a 100-TQFP package. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The part operates at 5V supply voltage with a maximum propagation delay of 7.5 nanoseconds and supports in-system programming capability.

Substiute Parts

EPM7128STC100-7

IntelIn Stock: 2440EPM7128STC100-7 Datasheet

Current PartRFQ

ATF1508AS-10AU100

Microchip TechnologyIn Stock: 1435ATF1508AS-10AU100 Datasheet

MFR RecommendedRFQ

ATF1508AS-7AX100

Microchip TechnologyIn Stock: 3232ATF1508AS-7AX100 Datasheet

MFR RecommendedRFQ

XCR3128XL-7VQG100C

AMDIn Stock: 9257XCR3128XL-7VQG100C Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the EPM7128STC100-7 is determined by the following critical parameters:

• Macrocell Count: 128 macrocells (functional equivalent requirement)
• Package Type: 100-pin TQFP or compatible footprint
• Programmable Type: In-system programmable capability
• Propagation Delay: Maximum 7.5 ns or faster
• Voltage Supply: 5V nominal operation or compatible range
• Operating Temperature Range: 0°C ~ 70°C minimum
• I/O Count: 80 or more pins for functional compatibility

Two substitute parts meet these criteria with varying compliance profiles:

ATF1508AS-7AX100 (Microchip Technology): Matches the original part's 7.5 ns delay specification, 128 macrocells, 5V supply range, and 0°C ~ 70°C operating temperature. Offers improved RoHS3 compliance and active product status.

ATF1508AS-10AU100 (Microchip Technology): Provides 128 macrocells and 100-TQFP package with 10 ns delay specification. Supports extended operating temperature range (-40°C ~ 85°C) and wider supply voltage tolerance (4.5V ~ 5.5V).

XCR3128XL-7VQG100C (AMD): Delivers 128 macrocells with 7 ns delay performance and 84 I/O pins matching the original part. Operates at 3V ~ 3.6V supply voltage with 100-VQFP package. Product status is Last Time Buy.

Parameter Comparison

Engineering Selection Recommendations

ATF1508AS-7AX100 is the primary substitute for direct replacement in designs requiring identical timing specifications and voltage supply parameters. This part maintains the 7.5 ns propagation delay and 5V supply range of the original EPM7128STC100-7. Active product status and ROHS3 compliance provide long-term availability and regulatory alignment for new production.

ATF1508AS-10AU100 serves as an alternative where timing margin exists beyond 7.5 ns. The extended operating temperature range (-40°C ~ 85°C) and wider supply voltage tolerance (4.5V ~ 5.5V) accommodate designs with broader environmental requirements. Active product status ensures sustained supply chain support.

XCR3128XL-7VQG100C offers superior timing performance at 7 ns with matching I/O count (84 pins). The 3V ~ 3.6V supply voltage requires circuit redesign for power distribution and signal level translation. Last Time Buy status indicates limited future availability; this option is suitable only for designs where the performance advantage and voltage compatibility justify redesign effort.

Frequently Asked Questions (FAQ)

Q: Can ATF1508AS-7AX100 replace EPM7128STC100-7 without circuit modification?

A: ATF1508AS-7AX100 provides functional equivalence in macrocell count (128), timing (7.5 ns), and supply voltage (4.75V ~ 5.25V). However, the I/O pin count differs (80 vs. 84 pins). Circuit board layout and signal routing must be verified for compatibility with the reduced I/O availability.

Q: What is the primary difference between ATF1508AS-7AX100 and ATF1508AS-10AU100?

A: The primary difference is propagation delay specification: ATF1508AS-7AX100 specifies 7.5 ns maximum delay, while ATF1508AS-10AU100 specifies 10 ns. ATF1508AS-10AU100 also provides extended operating temperature range (-40°C ~ 85°C) and wider supply voltage tolerance (4.5V ~ 5.5V). Selection depends on timing requirements and environmental operating conditions.

Q: Why does XCR3128XL-7VQG100C use a different package designation (VQFP vs. TQFP)?

A: Both packages are 100-pin, 14x14 mm surface mount packages with identical footprint dimensions. VQFP (Very thin Quad Flat Package) and TQFP (Thin Quad Flat Package) are functionally interchangeable for PCB assembly. Verify with your PCB design tool and assembly partner for any specific handling or reflow profile differences.

Q: Is XCR3128XL-7VQG100C suitable for new designs?

A: XCR3128XL-7VQG100C carries Last Time Buy status, indicating limited future availability. This part is not recommended for new designs requiring long-term production support. Use ATF1508AS-7AX100 or ATF1508AS-10AU100 for designs with extended production lifecycles.

Q: What are the RoHS compliance implications of selecting a substitute?

A: EPM7128STC100-7 is RoHS non-compliant. Both ATF1508AS-7AX100 and ATF1508AS-10AU100 are ROHS3 compliant, meeting current regulatory requirements for new production. XCR3128XL-7VQG100C is also ROHS3 compliant. Substitute selection improves regulatory alignment for products subject to RoHS directives.

Q: Can I use ATF1508AS-10AU100 in applications requiring 7.5 ns timing?

A: ATF1508AS-10AU100 specifies 10 ns maximum propagation delay, which exceeds the 7.5 ns requirement of the original part. Use this substitute only in designs where timing margin accommodates the additional 2.5 ns delay, or where system clock frequencies permit the slower device operation.